I don't think Xehanort's even capable of remorse.

[Riku finds it so much harder to trust and to forgive, that Sora will always continue to surprise him. Still, he's grateful for it.]

You don't have to thank me, Sora. Just keep doing what you think is right. [And Riku will be right there to support you -- and bail you out if things go wrong. That's how it always goes.]